how to type 'System.String' to type'System.Data.DataTable'

I want This problem solved:

Unable to cast object of type 'System.String' to type 'System.Data.DataTable'.

View state value Get source code Here:

string message = TxtMsg.Text;

MatchCollection mc = Regex.Matches(message, @"\*");

int limit = Math.Min(mc.Count, replacements.Length) - 1;

for (int i = limit; i >= 0; i--)

{

message = message.Remove(mc[i].Index, 1).Insert(mc[i].Index, replacements[i]);

}

TxtMsg.Text = message.ToString();

ViewState["Message"] = message.ToString();--> here i am get Viewsate data

My source code:

This source how to convert viewstate value convert System.String' to type 'System.Data.DataTable'.

if (ViewState["Message"] != null)

{

DataTable objDt = new DataTable();

objDt = (DataTable)ViewState["Message"];

for (int i = 0; i < objDt.Rows.Count; i++)

{

}

Thanks

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