Set value of button based on returned value

Question

I am using a GridView in asp.net.

The first column is a list of button controls -

<ItemTemplate>
  <asp:Button ID="statusButton" runat="server" Text="Select" 
            OnClick="statusButton_CheckedChanged" />
</ItemTemplate>

However I want to modify the background color and Text values of this button on data bind based on the value of another column in the table.

My problem being I need to check the values of the other column as they are retrieved, they will either be 1 or -1 and that value will set the design of the button.

How can I check the values of this bound field -

<asp:BoundField DataField="EXCLUDE" HeaderText="EXCLUDE" SortExpression="EXCLUDE" 
     ReadOnly="True" HeaderStyle-CssClass = "hideGridColumn" 
     ItemStyle-CssClass="hideGridColumn"/>

To then set the colour and text of the button?

Edwin de Koning · Accepted Answer · 2013-02-25 13:47:04Z

1

You can use the RowDataBound event of the gridview, for example:

    myGrid.RowDataBound += new GridViewRowEventHandler(myGrid_RowDataBound);
    void myGrid_RowDataBound(object sender, GridViewRowEventArgs e)
            {
                //Raised after each row is databound
                if (e.Row.RowType == DataControlRowType.DataRow)
                {
                    string value = e.Row.Cells[5].Text; //sixth column
                    if (value == "1")
                    {
                        //change button color (assuming button is in first column)
                        Button myButton = e.Row.Cells[0].Controls[0] as Button;
                        myButton.BackColor = Color.Red;

edited Feb 25, 2013 at 13:47

answered Feb 25, 2013 at 11:46

Edwin de Koning

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2 Comments

Ebikeneser Over a year ago

This can retrieve the values! However the button gets this error -Cannot implicitly convert type 'System.Web.UI.Control' to 'System.Web.UI.WebControls.Button'. An explicit conversion exists are you missing a cast? How can I resolve this?

Edwin de Koning Over a year ago

@Jambo: try e.Row.Cells[0].Controls[0] as Button; I updated my answer as well

शेखर · Accepted Answer · 2013-02-25 11:52:01Z

1

Change it as follows

<ItemTemplate>
     <asp:Button ID="statusButton" runat="server" Text="Select" 
        OnClick="statusButton_CheckedChanged" />
</ItemTemplate>

use different css-classes according to your condition

.class1{
 color:red;
 font-size:10;
}
.class2{
 color:blue;
 font-size:12;
}

<ItemTemplate>
     <asp:Button ID="statusButton" runat="server" Text="Select" 
        CssClass='<%# Convert.ToString(Eval("EXCLUDE"))== "1" ? "class1" : "class2" %>' 
        OnClick="statusButton_CheckedChanged" />
</ItemTemplate>

You can use it from the C# on RowDataBound event as suggested by @edwin

edited Feb 25, 2013 at 11:52

answered Feb 25, 2013 at 11:45

शेखर

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1 Comment

Ebikeneser Over a year ago

Good advice with the CSS class however I needed slightly more control over handling the values in the code behind.

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