Question

I have a Gridview that I want to filter. My gridview is in an update panel and my filter button is not. On button click i have the following

protected void bttnfilter_Click(object sender, ImageClickEventArgs e)
{
    if (TextBox1.Text != "")
    {
        SqlDataSource1.SelectCommand += " and field like '%' + @param + '%'";
        SqlConnection conn = new SqlConnection(SqlDataSource1.ConnectionString );
        SqlCommand cmd = new SqlCommand(SqlDataSource1.SelectCommand, conn);
        cmd.Parameters.Add(new SqlParameter("@param", TextBox1.Text));
    }

}

So i add to the select command but I’m getting an error. How should I go about this? I don’t want to use dynamic sql.

The Error Reads
Incorrect Syntax near ‘and’

Answer 1

Something like this should do it

private void bttnfilter_Click(object sender, ImageClickEventArgs e)
{
    string filterText = TextBox1.Text.Trim().ToLower();

    if (!String.IsNullOrEmpty(filterText))
        SqlDataSource1.FilterExpression = 
            string.Format("field LIKE '%{0}%'",filterText);         
}