How i Remove or Hide the column Auto Generated fields of GridView at Runtime.

Question

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Hello

How can I Remove or hide the column Auto Genrated Fields of Gridview at Run Time?
now in current code the output (Runtime) Gridview shows the same column fields as stored in database. I want to display selected fields.

Code:

protected void Button1_Click(object sender, EventArgs e)
  {
      GridView1.Visible = true;
      SqlCommand cmd = new SqlCommand();
      cmd.Parameters.Add("@ten", SqlDbType.Float).Value = TextBox1.Text;
      cmd.Parameters.Add("@twel", SqlDbType.Float).Value = TextBox2.Text;
      cmd.CommandText = "select * from table1 where (ten >=  @ten) and (twel >= @twel)";
      cmd.Connection = con;
      SqlDataReader dr;
      dr = cmd.ExecuteReader();
      if (dr.HasRows)
      {
          dr.Read();
          GridView1.DataSource = dr;
          GridView1.DataBind();
                         // To edit Header Text of gridview at run time
          GridViewRow header = GridView1.HeaderRow;
          header.Cells[0].Text = "10th %age";
          header.Cells[1].Text = "12th %age";
      }
      GridView1.Columns.RemoveAt(1);
  }

When I use GridView1.Columns.RemoveAt(1);
for removing second column then ERROR is:
Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index

in this code out put is shows the both 2 fields. and required is only first field.
If there is an another method then please suggest me...

[edit]Code block added, "Ignore HTML..." option disabled - OriginalGriff[/edit]

Posted 1-Mar-11 23:45pm

Shagun Bansal

Updated 1-Mar-11 23:54pm

OriginalGriff

v3

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3 solutions

Solution 1

The optimal method would be selecting required columns. Why select all columns and hide after that, though ways are there to hide.

Posted 1-Mar-11 23:57pm

Albin Abel

Updated 1-Mar-11 23:59pm

v2

Solution 2

Suppose you have 3 columns in a gridview.
"ID", "Name", "Age"
Index value of these columns would be 0, 1, 2

so if you wanna remove the column "Name", you'd use.
GridView1.Columns.RemoveAt(1);
After you do that The Grid will re-arrange its columns. It will have 2 columns then.
"ID", "Age".
So technically this code won't work.

GridView1.Columns.RemoveAt(1);
GridView1.Columns.RemoveAt(2);
Index will be out of range. Cause after first line of code it has re-arranged the columns with the indexes.

MIDL

GridView1.Columns.RemoveAt(1);
GridView1.Columns.RemoveAt(1);

But this will remove both "Name" and "Age" columns.

While you're using loop, remember to do i-- when the RemoveAt() condition meets.

Posted 1-Mar-11 23:59pm

Md Nazmoon Noor

Updated 2-Mar-11 0:02am

v2

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OriginalGriff · Accepted Answer · 2011-03-02T00:00:00

Firstly, are you sure there are any table rows which meet your conditions? If there aren't, then

C#

if (dr.HasRows)

will fail, and you will not bind any data to the GridView.
This would cause the error you describe!

Try moving

MIDL

GridView1.Columns.RemoveAt(1);

up into the block where you bind the data...

But why are you getting data from the database if you don't want it? It is a lot more efficient to change your SELECT statement:

SQL

cmd.CommandText = "select * from table1 where (ten >=  @ten) and (twel >= @twel)";

To

SQL

cmd.CommandText = "select ten from table1 where (ten >=  @ten) and (twel >= @twel)";

and not to return the content of column one at all.

It is generally considered bad practice to use "SELECT * FROM" when you know what the fields you are interested in are...