Now it is working and grid view control showing strArr values. Thank You.
protected void ddlCircle_SelectedIndexChanged(object sender, EventArgs e)
{
ShadingAnalysisDataSetTableAdapters.tbl_CadEngineersTeamTableAdapter cd;
cd = new ShadingAnalysisDataSetTableAdapters.tbl_CadEngineersTeamTableAdapter();
DataTable dt = new DataTable();
dt = cd.GetAvailableData(ddlCircle.SelectedValue);
int x, y;
DataTable dt3 = new DataTable();
dt3 = cd.GetTeam();
y = dt3.Rows.Count;
x = dt.Rows.Count;
DataTable dt2 = new DataTable();
dt2 = cd.GetAssignTeam(x);
string[] arr = new string[dt2.Rows.Count];
int i = 0;
foreach (DataRow r in dt2.Rows)
{
arr[i] = r["Team"].ToString();
i++;
}
string[] strArr = new string[x+1];
i = 0; int j = 0;
while (j <= x)
{
strArr[j]= arr[i] ;
i++;
j++;
if (i == 3)
{
i = 0;
}
}
GridView2.DataSource = strArr;
GridView2.DataBind();
}