Index was out of range : Datagridview

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Hi All,

I think i screwed up something in my code,it throws this exception all the time when the cell clicked

"Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index"

here is my code

C#

void dgMessages_CellClick(object sender, DataGridViewCellEventArgs e)
     {

         //try
         //{
             // Ignore clicks that are not on button cells.
             if (e.RowIndex < 0 || e.ColumnIndex != dgMessages.Columns["clmMessageId"].Index) return;
             //// Retrieve the Row Index
             string RowId = dgMessages[0, e.RowIndex].Value.ToString();

             //// convert string to Interger
             int RowIndex;
             int.TryParse(RowId, out RowIndex);
             //Row Index calculation here
             int RowAdj = RowIndex - 1;
             //Retrive the Error Queue Message for that particular Row Index
              string MesId = dgMessages.Rows[RowAdj].Cells["clmTransMessage"].Value.ToString();

this is where it throw's exception

C#

string MesId = dgMessages.Rows[RowAdj].Cells["clmTransMessage"].Value.ToString();

Am filling my datagridview from sql table.

Posted 25-Aug-11 17:37pm

shan1395

Updated 25-Aug-11 18:31pm

Tarun.K.S

v2

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2 solutions

Solution 1

Before the assignment, you can validate whether the particular cell has the value or not.

if (dgMessages.Rows[RowAdj].Cells["clmTransMessage"].HasValue)
{
   String MesId=dgMessages.Rows[RowAdj].Cells["clmTransMessage"].Value.ToString();
}

Itz safer code to avoid index out of range error.

Posted 25-Aug-11 17:48pm

Ganesan Senthilvel

Comments

shan1395 25-Aug-11 23:54pm

i has a value in it.

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sagar15modi · Accepted Answer · 2011-08-25T18:03:00

Index out of range error comes when you try to access row/cell not available in grid and as you use
int RowAdj = RowIndex - 1; in your code you need to put below condition to avoid this.

C#

if (RowIndex > 0)
{
   int RowAdj = RowIndex - 1;
   //Retrive the Error Queue Message for that particular Row Index
   string MesId = dgMessages.Rows[RowAdj].Cells["clmTransMessage"].Value.ToString();
}