i want to Show Thousand Separator in Datagridview Column
So i added One Column in datagridview so i Run this code But It's not working with me
You need to explicitly specify the column's ValueType if you don't have a DataSource to bind (ex. DataTable) which is the source of the data types as well. Here, you need a column of a numeric type such as Decimal.
So, before you populate the grid or add new rows, do:
With DataGridView2.Columns(0)
.ValueType = GetType(Decimal)
.DefaultCellStyle.Format = "#,#.##"
End With
In case the control is bound to DataSource, make sure that the type of the data field/property in question is numeric.
Related
I am working on VB in Visual Studio 2010. And I've seen errors of greatness in which when I double click on a line of datagridview, I get the values of its columns in such a way.
Datagridview1.SelectedRows(0).Cells(1).Value
But the most surprising thing is that with this same code I get the values of different columns each time without changing the index value in Cells(). I also put the name of the column inside the Cells(), but I did not get any value from this too.
Datagridview1.SelectedRows(0).Cells("name").Value
And the first column of this datagridview Cells(0) always returns the null value itself. I do not know how.
I have also used some column formating. like
With Datagridview1
.ColumnCount =2
.Columns(0).HeaderText ="Name"
.Columns(0).DataPropertyName = "pname"
.Columns(0).Width =100
.Column(1).HeaderText = "Son of"
.Column(1). DataPropertyName = "fname"
The big problem here is that it gives value to different columns each time with a single code
Is there any solution available for this?
I am binding data to a datagridview from a MSSQL database, there are mixed datatypes and I think vb.net by default sets the valuetype of the column/cell based on the data.
My requirement is that I want all the columns to have the value type of string.
I tried doing the following, before & after binding the data.
datagridview1.AutoGenerateColumns = False
colQty.ValueType = GetType(String)
You can set the ColumnType when the column is created. You can do this in code, or using the Designer in Visual Studio. It is worth noting that once a column is created [at run time] the ColumnType cannot be changed. You can of course add new columns as needed at run-time:
Dim col as New DataGridViewTextBoxColumn
datagridview1.Columns.Add(col)
Changing a ColumnType in the designer can be accomplished From the DataGridView Tasks fly-out menu as shown below:
I am having some trouble with a sorting an unbound DataGridView. I am filling a DataTable from a StreamReader, and then manually transferring the items from the DataTable to the DataGridView. The AllowUserToAddRows property is set to true on the DataGridView.
This populates the DataGridView, without any trouble. I can sort the columns by clicking on the column headers without any issue. If I add a value to the first column in a new row, and then try to sort the column, I get an error message that shows: "Object must be of type String."
I have tried different ways of converting all of the cells in the column to the same datatype, but I cannot get around this issue. Am I missing something here?
In the form load event, I have the following code:
dgvStartingGrid.Columns(0).ValueType = GetType(Integer)
I also am making sure that the values from the StreamReader are Integer types before entering them in the DataGridView:
If IsNumeric(strColumnValue) Then
dtbFillGrid.Rows(intCurrentRow).Item("Starting Position") = strColumnValue
End If
I have also tried:
dtbFillGrid.Rows(intCurrentRow).Item("Starting Position") = CInt(strColumnValue)
What could cause this issue? I have verified that all of the cells in the column are of the same datatype, but it still gives me an error, and I am sure that it is this column that is the problem.
The other columns are of string type, and I do not have any issue sorting them by their column headers, unless I click the first column, and then the exception is thrown.
Right, after some testing I found this out.
Even though you have set your DataGridView column to be Integer it doesn't mean that it will be filled with Integers. Unless you alter the datatype of the DataTable the DataGridView is actually filled with strings. The sorting function on a DataGridView is not based on column type, it is based on the first value it finds. And since you that value is a string, you get an error when it reaches your typed value (which is an Integer).
So here is what you have to do.
dtbFillGrid.Columns.Item(0).DataType = GetType(Integer)
Where 0 is the column containing Integer.
I have a datagridview that has been populated from a datatable using the datasource property. I need to change the value of a cell without affecting the database. So far I could only find that I have to first change the databound item but no information about how to do that. Besides, I don't want to change the databound item.
The reason for wanting to do this is that I have a list of records with a start and end time and there is a computed field that gives the difference in seconds. I need to change the value of the computed field and change the height of the row accordingly, that is, the height of each row is proportional to the duration it represents. Changes are done from a text box which increments quickly if the "increase" button is kept down and therefore I cannot change the database with each increment. Rather I would change the value in the table frequently and update the database once the increments stops.
I have tried updating the datagridview directly using this code:
dgvTasks.Rows(SelectedRowIndex).Cells(5).Value = DateAdd(DateInterval.Minute, DateDiff(DateInterval.Minute, CDate("00:00:00"), CDate(txtDuration.Text & ":00")), dgvTasks.Rows(SelectedRowIndex).Cells(4).Value)
But receive the error:
System.Data.ReadOnlyException: Column 'Column1' is read only.
I also tried updating the datatable, and allowing the calculated column to update:
dtblTasks.Rows(SelectedRowIndex)(5) = DateAdd(DateInterval.Minute, DateDiff(DateInterval.Minute, CDate("00:00:00"), CDate(txtDuration.Text & ":00")), dtblTasks.Rows(SelectedRowIndex)(4))
dgvTasks.DataSource = dtblTasks
But the calculated value doesn't change.
I am also providing an additional calculated value (in the SQL) where I find the difference in minutes and the append a string literal to that:
( CAST ( DATEDIFF(MINUTE, Tasks.TaskStart, Tasks.TaskEnd) AS NVARCHAR(10) ) + ' mins') AS TaskDurationString
Is there a way to detach the grid from the datasource but still keep the data visible in the datagrid and manipulate it (without affecting the databound object)? Or perhaps some other approach to this problem?
Updating the calculated column in the DataTable should work - I've just tried it, and both when I edit one of the values that are part of the calculated value, and when I change the value in code, that column is recalculated and the grid UI updates.
One thing to check is that you are calculating the value correctly. You should be using the DataTable~ column [Expression` property]1. Something like this:
dt.Columns["FullName"].Expression = "FirstName + LastName";
Since it appears that you don't actually need to bind any of these values to the DataTable or persist them to the database, one possible solution is to do all of this in an unbound DataGridView calculation column.
To do that add a column using the designer, then in the cell validating event have something like this:
void dataGridView1_CellValidated(object sender, DataGridViewCellEventArgs e)
{
dataGridView1.Rows[e.RowIndex].Cells["TargetColumn"].Value = dataGridView1.Rows[e.RowIndex].Cells["FirstName"].Value.ToString() + dataGridView1.Rows[e.RowIndex].Cells["LastName"].Value.ToString();
dataGridView1.Rows[e.RowIndex].Height = dataGridView1.Rows[e.RowIndex].Cells["LastName"].Value.ToString().Length + dataGridView1.Rows[e.RowIndex].Cells["FullName"].Value.ToString().Length;
}
I have a gridview that is bound to a datasource (Windows Forms, VB.NET). One of columns is a property of type boolean, and I want to show "yes/no" in the column instead of 0/1 or "true/false". Is this possible? Can you edit displays of columns that are bound?
I have encountered the same problem, unfortunately I didn't find an elegant solution.
Three workarounds are proposed:
Add another property to the data source's class, which returns your string representation of the boolean property. Hide the column showing the boolean value, display the column showing the string value.
Add an unbound string column, populate that column with the appropriate value for each row, and hide the boolean bound column.
Create a wrapper class for your data class, which exposes the properties as you'd like them to be shown in the datagrid.